Define pro.
Business pro's would fit this fine. Same with web designers, engineers, writers, etc.
Pro is a much wider field than the graph ad movie guys.
But since Apple was focused, maybe still is, on movie guys which I make part of, then that's what pro means (for me). Business pros don't need MBP's power to run a Word processor nor do writers need anything stronger than the current MBA for Final Draft or Scrivener. I don't know about engineers though, some need a powerful computer to run intensive 3D and modeling software.
I'm getting the next design of the 17 inch providing it still has an Express Card slot, a powerful video card and the ports I need, otherwise I'll get the last version refurbished. Pro has to do with power and connectivity in my opinion.